Temperature Effect on Early Oxidation Behavior of NiCoCrAlY Coatings: Microstructure and Phase Transformation

查看全文 作　　者：[1,2]A.Ullah;[1,3]A.Khan;[2]Z.B.Bao;[4]Y.F.Yang;[2]M.M.Xu;[2]S.L.Zhu;[5]F.H.Wang

机构地区：[1]University of Chinese Academy of Sciences,Beijing 100049,China;[2]Shi-Changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[3]Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials,Ministry of Education,School of Materials Science and Engineering,Anhui University of Technology,Maanshan 243000,China;[4]Institute of Advanced Wear and Corrosion Resistant and Functional Material,Jinan University,Guangzhou 510632,China;[5]Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China

出　　处：《Acta Metallurgica Sinica(English Letters)》索引2022年第35卷第6期,共10页

基　　金：sponsored by the R&D Program in Key Fields of Guangdong Province(No.2019B010936001);the National Natural Science Foundation of China(Grant No.51671202);supported by the National Engineering Laboratory for Marine and Ocean Engineering Power System-Laboratory for Ocean Engineering Gas Turbine;。 摘　　要：Initial oxidation behavior of NiCoCrAlY coating prepared by arc-ion plating has been studied in air at 900, 1000 and 1100 ℃. The results showed that phase transformation from transient θ-Al_(2)O_(3) to α-Al_(2)O_(3) was highly related to the temperature and oxidation time. The oxide scale in the initial stage was mainly composed of θ-Al_(2)O_(3) at 900 ℃. Instead, more amount of α-Al_(2)O_(3) emerged out with increasing oxidation temperature. The elemental distribution after oxidation confirmed that faster chromium diffusion to the oxide scale played an important role in the speedy transformation from θ-Al_(2)O_(3) to α-Al_(2)O_(3). Y segregation at scale/coating interface resulted in less cavity formation and hence improved the oxide scale adherence. 关键词：MCrAlY coating Phase transformation Isothermal oxidation Temperature effect

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Temperature Effect on Early Oxidation Behavior of NiCoCrAlY Coatings: Microstructure and Phase Transformation

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